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163 lines
5.2 KiB
163 lines
5.2 KiB
C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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C=======================================================================
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SUBROUTINE CONTF (CNTR, VARNP, NLNKF, LINKF1,
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& XN, YN, ZN, XF, YF, ZF)
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C=======================================================================
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C --*** CONTF *** (DETOUR) Plot line contours for a face
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C -- Written by Amy Gilkey - revised 10/22/87
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C -- D. P. Flanagan, 03/30/83
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C --
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C --CONTF draws a contour line for a face. The contour algorithm
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C --assumes that the elements do not contain internal nodes.
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C --The element interpolation field is approximated by logically drawing
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C --lines from each node to the element center and, thusly, dividing the
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C --element into triangles. Contour lines are then drawn by connecting
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C --the intersection points of the sub-element edges and the contour plane.
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C --
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C --Parameters:
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C -- CNTR - the contour value
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C -- VARNP - IN - the contour function values
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C -- NLNKF - IN - the number of nodes per face
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C -- LINKF1 - IN - the connectivity for the face
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C -- XN, YN, ZN - IN - the nodal coordinates
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C -- XF, YF, ZF - IN - the face center coordinates
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C -- * - return statement if the cancel function is active
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C --
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C --Common Variables:
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C -- Uses IS3DIM of /D3NUMS/
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COMMON /D3NUMS/ IS3DIM, NNPSUR, NUMNPF, LLNSET
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LOGICAL IS3DIM
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REAL VARNP(*)
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INTEGER LINKF1(NLNKF)
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REAL XN(*), YN(*), ZN(*)
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LOGICAL INTERP_BL
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LOGICAL CROSSL, CROSSN
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C --Compute the minimum and maximum values for the face
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FEMAX = VARNP(LINKF1(1))
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FEMIN = VARNP(LINKF1(1))
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DO 100 K = 2, NLNKF
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FEMAX = MAX (FEMAX, VARNP(LINKF1(K)))
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FEMIN = MIN (FEMIN, VARNP(LINKF1(K)))
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100 CONTINUE
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IF ((FEMIN .LE. CNTR) .AND. (FEMAX .GE. CNTR)) THEN
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C --Contour line runs through the face
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IF (NLNKF .EQ. 3) THEN
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C --Special case - triangle element
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N = LINKF1(2)
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FM = VARNP(N)
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XM = XN(N)
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YM = YN(N)
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NTRI = 1
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NNPF = NLNKF
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ELSE IF ((.NOT. IS3DIM) .AND. (NLNKF .EQ. 8)) THEN
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C --Compute center function value and coordinates
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FM = 0.0
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DO 110 K = 1, NLNKF, 2
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FM = FM - .25 * VARNP(LINKF1(K))
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110 CONTINUE
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DO 120 K = 2, NLNKF, 2
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FM = FM + .5 * VARNP(LINKF1(K))
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120 CONTINUE
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FM = FM
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XM = XF
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YM = YF
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NTRI = NLNKF
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NNPF = NLNKF
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ELSE IF ((.NOT. IS3DIM) .AND. (NLNKF .EQ. 9)) THEN
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C --Get center function value and coordinates
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FM = VARNP(LINKF1(9))
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XM = XN(LINKF1(9))
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YM = YN(LINKF1(9))
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NTRI = NLNKF - 1
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NNPF = NLNKF - 1
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ELSE
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C --Compute center function value and coordinates
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FM = 0.0
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DO 130 K = 1, NLNKF
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FM = FM + VARNP(LINKF1(K))
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130 CONTINUE
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FM = FM / NLNKF
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XM = XF
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YM = YF
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NTRI = NLNKF
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NNPF = NLNKF
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END IF
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N = LINKF1(NNPF)
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CROSSN = (INTERP_BL (CNTR, FM, VARNP(N), PSI))
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IF (CROSSN) THEN
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XCN = XM * (1.-PSI) + XN(N) * PSI
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YCN = YM * (1.-PSI) + YN(N) * PSI
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END IF
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DO 140 K = 1, NTRI
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L = N
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N = LINKF1(K)
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CROSSL = CROSSN
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IF (CROSSL) THEN
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XCL = XCN
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YCL = YCN
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END IF
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CROSSN = (INTERP_BL (CNTR, FM, VARNP(N), PSI))
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IF (CROSSN) THEN
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XCN = XM * (1.-PSI) + XN(N) * PSI
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YCN = YM * (1.-PSI) + YN(N) * PSI
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END IF
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IF (CROSSL .OR. CROSSN) THEN
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IF (INTERP_BL (CNTR, VARNP(N), VARNP(L), PSI)) THEN
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XC0 = XN(N) * (1.-PSI) + XN(L) * PSI
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YC0 = YN(N) * (1.-PSI) + YN(L) * PSI
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IF (CROSSL .AND. CROSSN) THEN
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C --There are three cases where the contour crosses the
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C --side and both middle lines: contour = middle point
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C --(go either way), contour = side last corner (go to
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C --next), contour = side next corner (go to last)
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IF ((ABS (XC0 - XCL) + ABS (YC0 - YCL)) .LT.
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& (ABS (XC0 - XCN) + ABS (YC0 - YCN)))
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& CROSSL = .FALSE.
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END IF
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IF (CROSSL) THEN
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CALL MPD2VC (1, XCL, YCL, XC0, YC0)
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ELSE
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CALL MPD2VC (1, XC0, YC0, XCN, YCN)
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END IF
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ELSE IF (CROSSL .AND. CROSSN) THEN
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CALL MPD2VC (1, XCL, YCL, XCN, YCN)
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ELSE
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C --If the contour crosses the next middle line but not
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C --the side or the last middle line (impossible with
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C --absolute accuracy), ignore crossing.
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CROSSN = .FALSE.
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END IF
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END IF
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140 CONTINUE
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END IF
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RETURN
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END
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